curl --request PATCH \
  --url https://api.attio.com/v2/objects/users/records/{record_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "data": {
    "values": {
      "user_id": "123",
      "primary_email_address": "person@company.com",
      "person": {
        "target_object": "people",
        "target_record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d"
      },
      "workspace": [
        {
          "target_object": "workspaces",
          "target_record_id": "72ef5feaf-4919-4208-b332-1339ab8ba040"
        }
      ]
    }
  }
}'

{
  "data": {
    "id": {
      "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
      "object_id": "97052eb9-e65e-443f-a297-f2d9a4a7f795",
      "record_id": "bf071e1f-6035-429d-b874-d83ea64ea13b"
    },
    "created_at": "2022-11-21T13:22:49.061281000Z",
    "web_url": "https://app.attio.com/salarya/person/bf071e1f-6035-429d-b874-d83ea64ea13b",
    "values": {
      "person": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "system",
            "id": null
          },
          "target_object": "people",
          "target_record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d",
          "attribute_type": "record-reference"
        }
      ],
      "primary_email_address": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "system",
            "id": null
          },
          "original_email_address": "person@company.com",
          "email_address": "person@company.com",
          "email_domain": "company.com",
          "email_root_domain": "company.com",
          "email_local_specifier": "person",
          "attribute_type": "email-address"
        }
      ],
      "user_id": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "system",
            "id": null
          },
          "value": "123",
          "attribute_type": "text"
        }
      ],
      "workspace": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "system",
            "id": null
          },
          "target_object": "workspaces",
          "target_record_id": "72ef5feaf-4919-4208-b332-1339ab8ba040",
          "attribute_type": "record-reference"
        }
      ]
    }
  }
}